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15 cities you should visit by train

Porto (Portugal) What: Lisbon's big rival (visitporto.travel
) can match the Portuguese capital for scenery. Famed for its fortified wine, it also revels in its splendid setting on the north bank of the River Douro. The south bank is occupied by another city entirely - Vila Nova de Gaia. Leading attraction: The Dom Luis I Bridge (above), a 172-metre metal arch, built between 1881 and 1886, which connects Porto and Vila Nova de Gaia in dramatic fashion - not least thanks to the pedestrian walkway which offers epic views from the upper tier. Read more: Portugal destination guide